ya tried Newtons 2 law
F=dp/dt
F=vdm/dt+mdv/dt
here in above equation dm/dt and dv/dt are variable but at the terminal velocity net force is zero but this is not possible as both the terms are variable,,,,,
I m solving the problem in which the drop is falling from some height and its size is increasing with the rate dm/dt=kMv where v is the velocity of the drop at that instant , so we have to find the terminal velocity of the drop gained due to air drag,
The problem is that if the drop gains...